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SPECIFICATIONS
1–12
NEUTRAL DIRECTIONAL OVERCURRENT (67N)
Directionality:........................................................ Co-existing forward and reverse
Polarizing:............................................................... Voltage, Current, Dual
Polarizing Voltage:.............................................. V_0 or VX
Polarizing Current:.............................................. Ig
Operating Current: ............................................. I_0
Level Sensing:....................................................... 3 x (|I_0| – K x |I_1|), Ig
Restraint, K: ........................................................... 0.000 to 0.500 in steps of 0.001
Characteristic Angle:......................................... -90º to 90º in steps of 1°
Limit Angle: ............................................................ 40º to 90º in steps of 1°, independent for forward and
Angle Accuracy:................................................... ±2º
Pickup Level: ......................................................... 0.050 to 30.000 x CT in steps of 0.001 x CT
Dropout Level:...................................................... 97 to 98% of Pickup
Operate Time (no direction transition): .... < 16 ms at 3 x Pickup at 60 Hz
GROUND DIRECTIONAL OVERCURRENT (67G)
Directionality:........................................................ Co-existing forward and reverse
Polarizing:............................................................... Voltage, Current, Dual
Polarizing Voltage:.............................................. V_0 or VX
Polarizing Current:.............................................. Isg
Operating Current: ............................................. Ig
Level Sensing:....................................................... Ig, Isg
Characteristic Angle:......................................... -90º to 90º in steps of 1°
Limit Angle: ............................................................ 40º to 90º in steps of 1°, independent for forward and
Angle Accuracy:................................................... ±2º
Pickup Level: ......................................................... 0.050 to 30.000 x CT in steps of 0.001
Dropout Level:...................................................... 97 to 98%
Operate Time (no direction transition): .... < 12 ms typical at 3 x Pickup at 60 Hz
SENSITIVE GROUND DIRECTIONAL OVERCURRENT (67SG)
Directionality:........................................................ Co-existing forward and reverse
Polarizing:............................................................... Voltage, Current, Dual
Polarizing Voltage:.............................................. V_0 or VX
Polarizing Current:.............................................. Ig
Operating Current: ............................................. Isg
Level Sensing:....................................................... Ig, Isg
Characteristic Angle:......................................... -90º to 90º in steps of 1°
Limit Angle: ............................................................ 40º to 90º in steps of 1°, independent for forward and
Angle Accuracy:................................................... ± 2º
Pickup Level: ......................................................... 0.005 to 3.000 x CT in steps of 0.001 x CT
Dropout Level:...................................................... 97 to 98%
Operate Time (no direction transition): .... < 12 ms typical at 3 × Pickup at 60 Hz
reverse
< 20 ms at 3 x Pickup at 50 Hz
reverse
< 15 ms typical at 3 x Pickup at 50 Hz
reverse
< 15 ms typical at 3 × Pickup at 50 Hz
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION
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